[已解决]批处理如何去除IP地址前面3段相同行？

wh1234567

例如文本内容：

58.18.22.133
58.18.22.142
58.18.32.12
58.18.34.142
58.18.70.69
58.18.104.58
58.18.104.212
将前面相同的3段行去除并输出：
58.18.32.12
58.18.34.142
58.18.70.69

lvsehuaxue

1. 
   
2. @echo off
   
3. for /f "tokens=1-4 delims=." %%i in (a.txt) do set /a .%%i.%%j.%%k+=1
   
4. (for /f "tokens=1-4 delims=.=" %%i in ('set .') do if %%l==1 findstr "%%i.%%j.%%k" a.txt)>$
   
5. move $ a.txt
   

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find

1. gawk -F. "NR==FNR{a[$1.$2.$3]++;next}a[$1.$2.$3]==1" a.txt a.txt >b.txt

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